128 Nemesis
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- For other uses, see Nemesis.
| Orbital characteristics 1 | |
|---|---|
| Orbit type | Main belt (Nemesian) |
| Semimajor axis | 2.750 AU |
| Perihelion distance | 2.399 AU |
| Aphelion distance | 3.101 AU |
| Orbital period | 4.56 years |
| Inclination | 6.25° |
| Eccentricity | 0.128 |
| Physical characteristics 1 | |
| Diameter | 188.2 km |
| Rotation period | 39 hours |
| Spectral class | C |
| Abs. magnitude | 7.49 |
| Albedo 4 | 0.050 |
| History 2 | |
| Discoverer | J. C. Watson, 1872 |
128 Nemesis is a very large and very dark main belt asteroid, of carbonaceous composition. It rotates rather slowly, taking about one and half Earth days to complete one revolution.
Nemesis is the largest member of the Nemesian asteroid family bearing its name.
It was discovered by J. C. Watson on November 25, 1872 and named after Nemesis, the goddess of retribution in Greek mythology.
Nemesis is also the name of a hypothetical companion star of the sun.
| Minor planets | ||
|---|---|---|
| Previous minor planet | 128 Nemesis | Next minor planet |
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| Vulcanoids | Near-Earth asteroids | Main belt | Jupiter Trojans | Centaurs | Damocloids | Comets | Trans-Neptunians (Kuiper belt · Scattered disc · Oort cloud) |
| For other objects and regions, see: asteroid groups and families, binary asteroids, asteroid moons and the Solar system For a complete listing, see: List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names. |
